The four brothers were delivered at 31 weeks to Tressa Montalvo, 36, via Cesarean section at The Woman’s Hospital of Texas in Houston.
Tressa and Manuel Montalvo Jr were not using any fertility drugs and had just hoped for a little brother or sister for their 2-year-old son, Memphis, according to a press release issued by the hospital.
“We planned the pregnancy — I guess we just succeeded a little too much,” said Ms Montalvo.
When Ms Montalvo was 10 weeks pregnant, her physician told her she was having twins, and on a subsequent visit, the doctor detected a third heartbeat.
The Montalvos were later told they were having four babies — not quadruplets but two sets of twins.
The odds of delivering two sets of naturally occurring identical twins is somewhere in the range of one-in-70-million, the hospital said.
Two boys shared one placenta and the two other boys shared another.
Ace and Blaine were born at 8.51am on Feb 14 and weighed 3lbs, 10oz (1.64kg), and 3lbs, 15oz (1.79 kg), respectively.
Cash and Dylan followed a minute later, weighing 2lbs, 15oz (1.33 kg), and 3lbs, 6oz (1.53 kg), respectively.
“We tried to stick to the A-B-C-D theme when naming them,” Ms Montalvo said. ”
“We didn’t expect it, we were trying for just one and we were blessed with four.”
Manuel Montalvo said in the release that they’re not done yet — he still wants a girl.